6 Result(s)
within
C. Callegari
Science, Humanities and Social Sciences, multidisciplinary
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Article
Open AccessUltrafast relaxation of photoexcited superfluid He nanodroplets
The relaxation of photoexcited nanosystems is a fundamental process of light–matter interaction. Depending on the couplings of the internal degrees of freedom, relaxation can be ultrafast, converting electroni...
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Article
Open AccessSymmetry breakdown of electron emission in extreme ultraviolet photoionization of argon
Short wavelength free-electron lasers (FELs), providing pulses of ultrahigh photon intensity, have revolutionized spectroscopy on ionic targets. Their exceptional photon flux enables multiple photon absorption...
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Article
Open AccessAcetylacetone photodynamics at a seeded free-electron laser
The first steps in photochemical processes, such as photosynthesis or animal vision, involve changes in electronic and geometric structure on extremely short time scales. Time-resolved photoelectron spectrosco...
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Article
Open AccessInteratomic Coulombic decay cascades in multiply excited neon clusters
In high-intensity laser light, matter can be ionized by direct multiphoton absorption even at photon energies below the ionization threshold. However on tuning the laser to the lowest resonant transition, the ...
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Article
Determining the polarization state of an extreme ultraviolet free-electron laser beam using atomic circular dichroism
Ultrafast extreme ultraviolet and X-ray free-electron lasers are set to revolutionize many domains such as bio-photonics and materials science, in a manner similar to optical lasers over the past two decades. ...
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Article
Open AccessCollective Autoionization in Multiply-Excited Systems: A novel ionization process observed in Helium Nanodroplets
Free electron lasers (FELs) offer the unprecedented capability to study reaction dynamics and image the structure of complex systems. When multiple photons are absorbed in complex systems, a plasma-like state ...
